Functional Significance of Medial Olivocochlear System Morphology in the Mouse Cochlea
| Autor: | Jung Mee Park, Sang Won Yeo, Shi Nae Park, So Young Park, Sang A Back |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Distortion Product Otoacoustic Emission
Morphology (linguistics) Efferent Terminal Efferent Otoacoustic emission Contralateral Suppression lcsh:Medicine Mouse Cochlea 03 medical and health sciences 0302 clinical medicine otorhinolaryngologic diseases Medicine Baso-Apical Gradient Distortion ProductOtoacoustic Emission Medial Olivocochlear Reflex 030223 otorhinolaryngology business.industry Olivocochlear system lcsh:R Anatomy lcsh:Otorhinolaryngology lcsh:RF1-547 medicine.anatomical_structure Otorhinolaryngology Reflex Functional significance Original Article Surgery Hair cell business 030217 neurology & neurosurgery |
| Zdroj: | Clinical and Experimental Otorhinolaryngology, Vol 10, Iss 2, Pp 137-142 (2017) CLINICAL AND EXPERIMENTAL OTORHINOLARYNGOLOGY(10): 2 Clinical and Experimental Otorhinolaryngology |
| ISSN: | 2005-0720 1976-8710 |
| Popis: | Objectives. Baso-apical gradients exist in various cochlear structures including medial olivocochlear (MOC) efferent system. This study investigated the cochlear regional differentials in the function and morphology of the MOC system, and addressed the functional implications of regional MOC efferent terminals (ETs) in the mouse cochlea. Methods. In CBA/J mice, MOC reflex (MOCR) was assessed based on the distortion product otoacoustic emission in the absence and presence of contralateral acoustic stimulation. High, middle, and low frequencies were grouped according to a mouse place-frequency map. Cochlear whole mounts were immunostained for ETs with anti-a-synuclein and examined using confocal laser scanning microscopy. The diameters of ETs and the number of ETs per outer hair cell were measured from the z-stack images of the basal, middle and apical regions, respectively. Results. The middle cochlear region expressed large, clustered MOC ETs with strong MOCR, the base expressed small, less clustered ETs with strong MOCR, and the apex expressed large, but less clustered ETs with weak MOCR. Conclusion. The mouse cochlea demonstrated regional differentials in the function and morphology of the MOC system. Strong MOCR along with superior MOC morphology in the middle region may contribute to 'signal detection in noise,' the primary efferent function, in the best hearing frequencies. Strong MOCR in spite of inferior MOC morphology in the base may reflect the importance of 'protection from noise trauma' in the high frequencies. |
| Databáze: | OpenAIRE |
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